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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec2bd4d3dfefaae2f9151e0e08be7bd4762bac6b76d4171324ece164c1d92b0' 
  AND token = 'y/cs1MSrY8q/whHocme2y3SpXM1cPye6GW+3h3ypWBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}